Emergency Colour Code Chart from Ontario Hospital Association

Orange = Disaster

https://www.oha.com/Documents/Emergency%20Preparedness%20Colour%20Codes%20Poster.pdf

*Crikey, they also list Code Orange CBRN:

"Code Orange. As discussed above, orange usually means there has been an external disaster. But orange can also mean there has been an event with mass casualties, depending on the province. It often means that the hospital should initiate protocols to prepare for the arrival of many new patients.

"In Ontario, there is also a more specific 'Code Orange: CBRN,' meaning the disaster is chemical, biological, radiological, or nuclear."

https://edmontonsun.com/wellness/code-orange-code-black-deciphering-secret-hospital-emergency-messages